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effector

effector (e-fek´tor, -tor)

1. C. Sherrington's term for a peripheral tissue that receives nerve impulses and reacts by contraction (muscle), secretion (gland), or a discharge of electricity (electric organ of certain bony fishes). 2. A small metabolic molecule that by combining with a repressor gene depresses the activity of an operon. 3. A small molecule that binds to a protein and, in so doing, alters the activity of that protein. 4. A substance, technique, procedure, or individual that causes an effect. [L. producer]

 

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